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Why is renewable energy important? % of the world’s energy supply is based around fossil fuels 2. At least millions of years for dead organisms to decompose and transform 3. Energy demand doubles every 14 years “By the year 2020, world energy consumption is projected to increase an additional 207 quadrillion (2.07 x ) BTUs. If the global consumption of renewable energy sources remains constant, the world’s available fossil fuel reserves will be consumed within 104 years.” - US Department of Energy,